Many large-format prints are viewed from a distance, but a wall display or vehicle door may also be inspected close up. For raster images, evaluate pixels per inch (PPI) at final size. Printer DPI is a different measure and cannot add missing image detail.
Viewing distance and sharpness
Viewing distance affects visible detail. A display read at arm length may need more image detail than a roadside banner. Start with audience and placement rather than reducing resolution simply because the print is large.
PPI at final size
Around 150 PPI can be a starting point for many large-format images; distant-viewed graphics may need less and close-viewed work more. Confirm the target for the product. Keep logos and type as vector when available.
Setting up your file
- Build at final output size (or scale proportionally).
- Use the effective PPI requested at final size. A file at one-tenth scale needs ten times that PPI at the working size.
- Do not scale up a low-res image; it will still look soft in print.
Common mistake
Changing a resolution label or enlarging a small image does not restore detail. Send the source image and finished size if unsure. Tell us explicitly when artwork is built at a reduced scale.